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Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Thyroid conditions may make getting pregnant impossible.
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There are 20 feet of blood vessels in each square inch of human skin.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.